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A. ANDERSON.

GRADING MACHINE.

APPLICATION man MAY 2?, |918.

Patented Dm. 28, M2@

AXEL ANDEESN, @F AMERY, WISCONSEN, ASSG'NOR T0 RUSSELL GRADE@ MANU- lPAGT'URENG C0., 0F 'MENNEPOLS, MINNEST, A COE'ERAEEON.

GRADNGr-MACHINE.

Specification of Letters Batent.

Patented Dee. 2d., 119262,

" application inea nav e7, taie. serial no. eaavee.

rlhe object of my invention is to provide means for use in connection with a quicklifting mechanism of a grader blade for` obtaining a line adjustment of the blade, either up or down, as -the character of the work may seem advisable.

A further object is to yprovide a mechanism of simple construction and one which can be conveniently manipulated and will add comparatively little to the expense of construction.

rlheinvention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

ln the accompanying drawings forming part of this specilication,

Figure 1 is a perspective view of a' grading machine embodyin my invention,

Fig. 2 is a detail side view of the blade adjusting mechanism, 1

Fig. 3 is a transverse sectional view through such mechanism.

ln the drawing, 2 represents a frame having rear supporting wheels 3 and forward supporting and guiding wheels 4.' 5 is a scraper blade carried by a' ring '6 that is mounted on a tongue 7 that is pivoted at the forward end of the frame 2 for vertical oscillation. 8 is a shaft mounted transversely on the middle portion of the frame 2 and 9 are quadrants secured to the side rails of said frame upon opposite sides thereof y and bridging the shaft 8. 10 represents levers loosely mounted on the shaft 8 and having locking latches 11 for engaging the teeth of the quadrants 9 to lock the levers 10 in` v any desired position. rFliese levers are preferably prcvided with curved rack bars 12, preferably projecting rearwardly and downwardly from said levers, and secondary levers 13 are pivoted on the levers 10 at 14 and have locklng latches 15 for engaging the teeth of the rack bars l2. .Bell cranks 16 are mounted on the shaft 8 and have one arm pivotally connected by links 17 with lateral extensions 18 of the tongue 7 and the other arms of the bell cranks entend above the Apivots lll and are connected b f links 19 with the secondary levers 13 near their pivots and preferably opposite the racks 9. The teeth of the rack bars 12 are much finer that those of the quadrants and when the scraper blade has been adjusted in the desired position by the movement of the levers 10., which will provide fora quick raising or lowering of the scraper blade, the operator will lock theselevers by means of their latches and then by the oscillation of the secondary levers 13 over the small teeth, provided in the rack bars forthat purpose, will be able to obtain a comparatively slow or tine adjustment of the scraper which would not be possible through the operation of the main levers 10. lt will be understood that when the latches of the main levers are released, movement will be imparted to the scraper blade through the rack bars and the secondary levers to the bell cranks, so that both mechanisms will be operated simultaneously, that is, the secondary levers will nieve back and forth with the main levers tor the quick adjustment of the scraper, but when. this adjustment has been obtained and the operator may desire a still further slight adjustment, either up or down, he can accomplish it by the movement of the secondary levers indef pendently of the main levers. llt sometimes happens in grading work that the operator of the machine wishes to raise or lower the scraper blade a little to accommodate it to some inequality of the roadway where the movement of the main levers a single notch would be too greatV an adjustment, and by means of the secondary levers this line or delicate adjustment may be easily obtained and the machine thereby be made capable of doing more accurate and better worlr than would be possible with the single adjustment of the main levers.

l claim as my invention:

1. rl'he combination, with a wheeled carrying frame and a scraper blade therefor, of a shaft mounted in said frame, levers loosely mounted on said shaft and having locking latches, and stationary quadrants having teeth for said latches, bell cranks loosely mounted on said shafts and having one arm connected with said scraper blade and secondary levers mounted on said main levers dit ice

` means pivotally connectingsad secondary levers with the other arm ofsaid bell cranks. 2. The combination, with a frame having carrying wheels, of a scraper blade supported thereby, primary lifting levers ivoted on said frame, bell cranks concentrica ly mounted with respect 'to said lifting levers and connected wlth said scraper, andsecondary levers pivoted on said primary levers and connected with said bell cranks,-and vmeans connecting said secondaryvlevers withaid primary levers for simultaneous movement therewith, or movement independently of said rimary levers. A

3. he combination, With a frame having carrying wheels, of a scraper blade supported thereby, primary lifting levers (pivoted or'. said frame, bell cranks pivote on said frame, and connected with saidscrapen secondary levers pivoted on said primary levers and connected with said bell cranks, and means connecting said secondary levers with said primary levers for simultaneous movement therewith 'or movement independently of said primary levers.

In Witness whereof I have 'hereunto set my hand this 15th day of A ril, 1918.

AX L ANDERSON. Witness:

ESTHER LINDs'rEm. 

